The Get Noticed! Theme uses a font for the Share Bar icons (“gntsocial”). You can override the default font using some custom CSS. For example, let’s say you wanted to use the FontAwesome.io icon set instead.

Just a heads up, you really should be using a child theme, but for this example, we can inject some code into the Custom CSS field (Get Noticed! > Theme Customizer > Custom CSS).

Here’s an example of the code:

And here’s it working: (Custom CSS won’t live update in the customizer, so be sure to save and refresh to see your changes)

Another shot of the rest of the icons:

A simpler solution, that might not require any custom code, is to use a third-party plugin. You can disable the native share bar completely by going to Get Noticed! > Share Bar. Set all the settings to “Off, no share bar”. There are dozens of free share bars available in the WordPress Plugin Directory: https://wordpress.org/plugins/